Q. If the two lines of regression are $x + 4y = 3\$and $3x + y = 15,$ then value of $x$ for$\ y = 3$ is
A) 4
B) -9
C) -4
D) None of these
Explanation
(a)
Let us assume that line of regression y on x +4y =3 and $x\ on\ y\ is\ 3x + y = 15.$
$\therefore put\ y = 3\ in\ 3x + y = 15$
$\Rightarrow 3x = 15 - 3$
$x = 4$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.